2 votes

In a row of girls, if Seeta who is $7$th from the left and Leena who is $9^{th}$ from the right interchange their seats, Seeta becomes $11$ th from the left. How many girls are there in the row?

- $16$
- $20$
- $22$
- None of these

1 vote

Best answer

Since, Seetha is $7^{th}$ from the left and Leena is $9^{th}$ from the right, when Seetha replace Leena, the position of Seetha from the right = $9.$ As per question, Seetha’s position from the left after interchanging $=11.$

Hence, the no. of girls in the row

$$\begin{align}&=\text{(Seetha’s position from the left + Seetha’s position from the right)-1}\\&=(9+11) -1\\&= 20-1\\&= 19\end{align}$$

So, answer is None of the above.

Hence, the no. of girls in the row

$$\begin{align}&=\text{(Seetha’s position from the left + Seetha’s position from the right)-1}\\&=(9+11) -1\\&= 20-1\\&= 19\end{align}$$

So, answer is None of the above.